3.84:2.4=x:1/4 x:0.75=20.25:1/8 3.6:4/3=1.8:x x:0.75=2:1.25 2/3:x=2/15:3/5 28:42=x:0.8

3.84:2.4=x:1/4 x:0.75=20.25:1/8 3.6:4/3=1.8:x x:0.75=2:1.25 2/3:x=2/15:3/5 28:42=x:0.8
3.84:2.4=x:1/4 x:0.75=20.25:1/8 3.6:4/3=1.8:x x:0.75=2:1.25 2/3:x=2/15:3/5 28:42=x:0.8

3.84:2.4=x:1/4 x:0.75=20.25:1/8 3.6:4/3=1.8:x x:0.75=2:1.25 2/3:x=2/15:3/5 28:42=x:0.8
1、3.84:2.4=x:1/4
2.4x=3.84*1/4
x=0.4
2、 x:0.75=20.25:1/8
x:0.75=20.25*8
x=20.25*8*3/4
=121.5
3、3.6:4/3=1.8:x
3.6x=1.8*4/3
x=3/8
4、x:0.75=2:1.25
1.25x=0.75*2
x=1.5/1.25=6/5
5、2/3:x=2/15:3/5
2/15x=3/5*2/3
x=3
6、28:42=x:0.8
42x=28*0.8
x=8/15